Anti-thumb sucking device



FIG. 1 is a right side elevation view of the anti-thumb sucking device showing my novel design;

FIG. 2 is left side elevation view thereof;

FIG. 3 is a front side elevation view thereof;

FIG. 4 is a back side elevation view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof. 

I claim the ornamental design for an anti-thumb sucking device, as shown and described. 